# frozen_string_literal: true

module Nokogiri
  module HTML4
    class ElementDescription
      # Methods are defined protected by method_defined? because at
      # this point the C-library or Java library is already loaded,
      # and we don't want to clobber any methods that have been
      # defined there.

      Desc = Struct.new(
        :name,
        :startTag,
        :endTag,
        :saveEndTag,
        :empty,
        :depr,
        :dtd,
        :isinline,
        :desc,
        :subelts,
        :defaultsubelt,
        :attrs_opt,
        :attrs_depr,
        :attrs_req,
      )

      # This is filled in down below.
      DefaultDescriptions = {} # rubocop:disable Naming/ConstantName

      def default_desc
        DefaultDescriptions[name.downcase]
      end
      private :default_desc

      unless method_defined?(:implied_start_tag?)
        def implied_start_tag?
          default_desc&.startTag
        end
      end

      unless method_defined?(:implied_end_tag?)
        def implied_end_tag?
          default_desc&.endTag
        end
      end

      unless method_defined?(:save_end_tag?)
        def save_end_tag?
          default_desc&.saveEndTag
        end
      end

      unless method_defined?(:deprecated?)
        def deprecated?
          default_desc&.depr
        end
      end

      unless method_defined?(:description)
        def description
          default_desc&.desc
        end
      end

      unless method_defined?(:default_sub_element)
        def default_sub_element
          default_desc&.defaultsubelt
        end
      end

      unless method_defined?(:optional_attributes)
        def optional_attributes
          d = default_desc
          d ? d.attrs_opt : []
        end
      end

      unless method_defined?(:deprecated_attributes)
        def deprecated_attributes
          d = default_desc
          d ? d.attrs_depr : []
        end
      end

      unless method_defined?(:required_attributes)
        def required_attributes
          d = default_desc
          d ? d.attrs_req : []
        end
      end

      ###
      # Default Element Descriptions (HTML 4.0) copied from
      # libxml2/HTMLparser.c and libxml2/include/libxml/HTMLparser.h
      #
      # The copyright notice for those files and the following list of
      # element and attribute descriptions is reproduced here:
      #
      # Except where otherwise noted in the source code (e.g. the
      # files hash.c, list.c and the trio files, which are covered by
      # a similar licence but with different Copyright notices) all
      # the files are:
      #
      #  Copyright (C) 1998-2003 Daniel Veillard.  All Rights Reserved.
      #
      # Permission is hereby granted, free of charge, to any person
      # obtaining a copy of this software and associated documentation
      # files (the "Software"), to deal in the Software without
      # restriction, including without limitation the rights to use,
      # copy, modify, merge, publish, distribute, sublicense, and/or
      # sell copies of the Software, and to permit persons to whom the
      # Software is fur- nished to do so, subject to the following
      # conditions:

      # The above copyright notice and this permission notice shall be
      # included in all copies or substantial portions of the
      # Software.

      # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
      # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
      # WARRANTIES OF MERCHANTABILITY, FIT- NESS FOR A PARTICULAR
      # PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE DANIEL
      # VEILLARD BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
      # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      # FROM, OUT OF OR IN CON- NECTION WITH THE SOFTWARE OR THE USE
      # OR OTHER DEALINGS IN THE SOFTWARE.

      # Except as contained in this notice, the name of Daniel
      # Veillard shall not be used in advertising or otherwise to
      # promote the sale, use or other deal- ings in this Software
      # without prior written authorization from him.

      # Attributes defined and categorized
      FONTSTYLE = ["tt", "i", "b", "u", "s", "strike", "big", "small"]
      PHRASE = [
        "em",
        "strong",
        "dfn",
        "code",
        "samp",
        "kbd",
        "var",
        "cite",
        "abbr",
        "acronym",
      ]
      SPECIAL = [
        "a",
        "img",
        "applet",
        "embed",
        "object",
        "font",
        "basefont",
        "br",
        "script",
        "map",
        "q",
        "sub",
        "sup",
        "span",
        "bdo",
        "iframe",
      ]
      PCDATA = []
      HEADING = ["h1", "h2", "h3", "h4", "h5", "h6"]
      LIST = ["ul", "ol", "dir", "menu"]
      FORMCTRL = ["input", "select", "textarea", "label", "button"]
      BLOCK = [
        HEADING,
        LIST,
        "pre",
        "p",
        "dl",
        "div",
        "center",
        "noscript",
        "noframes",
        "blockquote",
        "form",
        "isindex",
        "hr",
        "table",
        "fieldset",
        "address",
      ]
      INLINE = [PCDATA, FONTSTYLE, PHRASE, SPECIAL, FORMCTRL]
      FLOW = [BLOCK, INLINE]
      MODIFIER = []
      EMPTY = []

      HTML_FLOW = FLOW
      HTML_INLINE = INLINE
      HTML_PCDATA = PCDATA
      HTML_CDATA = HTML_PCDATA

      COREATTRS = ["id", "class", "style", "title"]
      I18N = ["lang", "dir"]
      EVENTS = [
        "onclick",
        "ondblclick",
        "onmousedown",
        "onmouseup",
        "onmouseover",
        "onmouseout",
        "onkeypress",
        "onkeydown",
        "onkeyup",
      ]
      ATTRS = [COREATTRS, I18N, EVENTS]
      CELLHALIGN = ["align", "char", "charoff"]
      CELLVALIGN = ["valign"]

      HTML_ATTRS = ATTRS
      CORE_I18N_ATTRS = [COREATTRS, I18N]
      CORE_ATTRS = COREATTRS
      I18N_ATTRS = I18N

      A_ATTRS = [
        ATTRS,
        "charset",
        "type",
        "name",
        "href",
        "hreflang",
        "rel",
        "rev",
        "accesskey",
        "shape",
        "coords",
        "tabindex",
        "onfocus",
        "onblur",
      ]
      TARGET_ATTR = ["target"]
      ROWS_COLS_ATTR = ["rows", "cols"]
      ALT_ATTR = ["alt"]
      SRC_ALT_ATTRS = ["src", "alt"]
      HREF_ATTRS = ["href"]
      CLEAR_ATTRS = ["clear"]
      INLINE_P = [INLINE, "p"]

      FLOW_PARAM = [FLOW, "param"]
      APPLET_ATTRS = [
        COREATTRS,
        "codebase",
        "archive",
        "alt",
        "name",
        "height",
        "width",
        "align",
        "hspace",
        "vspace",
      ]
      AREA_ATTRS = [
        "shape",
        "coords",
        "href",
        "nohref",
        "tabindex",
        "accesskey",
        "onfocus",
        "onblur",
      ]
      BASEFONT_ATTRS = ["id", "size", "color", "face"]
      QUOTE_ATTRS = [ATTRS, "cite"]
      BODY_CONTENTS = [FLOW, "ins", "del"]
      BODY_ATTRS = [ATTRS, "onload", "onunload"]
      BODY_DEPR = [
        "background",
        "bgcolor",
        "text",
        "link",
        "vlink",
        "alink",
      ]
      BUTTON_ATTRS = [
        ATTRS,
        "name",
        "value",
        "type",
        "disabled",
        "tabindex",
        "accesskey",
        "onfocus",
        "onblur",
      ]

      COL_ATTRS = [ATTRS, "span", "width", CELLHALIGN, CELLVALIGN]
      COL_ELT = ["col"]
      EDIT_ATTRS = [ATTRS, "datetime", "cite"]
      COMPACT_ATTRS = [ATTRS, "compact"]
      DL_CONTENTS = ["dt", "dd"]
      COMPACT_ATTR = ["compact"]
      LABEL_ATTR = ["label"]
      FIELDSET_CONTENTS = [FLOW, "legend"]
      FONT_ATTRS = [COREATTRS, I18N, "size", "color", "face"]
      FORM_CONTENTS = [
        HEADING,
        LIST,
        INLINE,
        "pre",
        "p",
        "div",
        "center",
        "noscript",
        "noframes",
        "blockquote",
        "isindex",
        "hr",
        "table",
        "fieldset",
        "address",
      ]
      FORM_ATTRS = [
        ATTRS,
        "method",
        "enctype",
        "accept",
        "name",
        "onsubmit",
        "onreset",
        "accept-charset",
      ]
      FRAME_ATTRS = [
        COREATTRS,
        "longdesc",
        "name",
        "src",
        "frameborder",
        "marginwidth",
        "marginheight",
        "noresize",
        "scrolling",
      ]
      FRAMESET_ATTRS = [COREATTRS, "rows", "cols", "onload", "onunload"]
      FRAMESET_CONTENTS = ["frameset", "frame", "noframes"]
      HEAD_ATTRS = [I18N, "profile"]
      HEAD_CONTENTS = [
        "title",
        "isindex",
        "base",
        "script",
        "style",
        "meta",
        "link",
        "object",
      ]
      HR_DEPR = ["align", "noshade", "size", "width"]
      VERSION_ATTR = ["version"]
      HTML_CONTENT = ["head", "body", "frameset"]
      IFRAME_ATTRS = [
        COREATTRS,
        "longdesc",
        "name",
        "src",
        "frameborder",
        "marginwidth",
        "marginheight",
        "scrolling",
        "align",
        "height",
        "width",
      ]
      IMG_ATTRS = [
        ATTRS,
        "longdesc",
        "name",
        "height",
        "width",
        "usemap",
        "ismap",
      ]
      EMBED_ATTRS = [
        COREATTRS,
        "align",
        "alt",
        "border",
        "code",
        "codebase",
        "frameborder",
        "height",
        "hidden",
        "hspace",
        "name",
        "palette",
        "pluginspace",
        "pluginurl",
        "src",
        "type",
        "units",
        "vspace",
        "width",
      ]
      INPUT_ATTRS = [
        ATTRS,
        "type",
        "name",
        "value",
        "checked",
        "disabled",
        "readonly",
        "size",
        "maxlength",
        "src",
        "alt",
        "usemap",
        "ismap",
        "tabindex",
        "accesskey",
        "onfocus",
        "onblur",
        "onselect",
        "onchange",
        "accept",
      ]
      PROMPT_ATTRS = [COREATTRS, I18N, "prompt"]
      LABEL_ATTRS = [ATTRS, "for", "accesskey", "onfocus", "onblur"]
      LEGEND_ATTRS = [ATTRS, "accesskey"]
      ALIGN_ATTR = ["align"]
      LINK_ATTRS = [
        ATTRS,
        "charset",
        "href",
        "hreflang",
        "type",
        "rel",
        "rev",
        "media",
      ]
      MAP_CONTENTS = [BLOCK, "area"]
      NAME_ATTR = ["name"]
      ACTION_ATTR = ["action"]
      BLOCKLI_ELT = [BLOCK, "li"]
      META_ATTRS = [I18N, "http-equiv", "name", "scheme"]
      CONTENT_ATTR = ["content"]
      TYPE_ATTR = ["type"]
      NOFRAMES_CONTENT = ["body", FLOW, MODIFIER]
      OBJECT_CONTENTS = [FLOW, "param"]
      OBJECT_ATTRS = [
        ATTRS,
        "declare",
        "classid",
        "codebase",
        "data",
        "type",
        "codetype",
        "archive",
        "standby",
        "height",
        "width",
        "usemap",
        "name",
        "tabindex",
      ]
      OBJECT_DEPR = ["align", "border", "hspace", "vspace"]
      OL_ATTRS = ["type", "compact", "start"]
      OPTION_ELT = ["option"]
      OPTGROUP_ATTRS = [ATTRS, "disabled"]
      OPTION_ATTRS = [ATTRS, "disabled", "label", "selected", "value"]
      PARAM_ATTRS = ["id", "value", "valuetype", "type"]
      WIDTH_ATTR = ["width"]
      PRE_CONTENT = [
        PHRASE,
        "tt",
        "i",
        "b",
        "u",
        "s",
        "strike",
        "a",
        "br",
        "script",
        "map",
        "q",
        "span",
        "bdo",
        "iframe",
      ]
      SCRIPT_ATTRS = ["charset", "src", "defer", "event", "for"]
      LANGUAGE_ATTR = ["language"]
      SELECT_CONTENT = ["optgroup", "option"]
      SELECT_ATTRS = [
        ATTRS,
        "name",
        "size",
        "multiple",
        "disabled",
        "tabindex",
        "onfocus",
        "onblur",
        "onchange",
      ]
      STYLE_ATTRS = [I18N, "media", "title"]
      TABLE_ATTRS = [
        ATTRS,
        "summary",
        "width",
        "border",
        "frame",
        "rules",
        "cellspacing",
        "cellpadding",
        "datapagesize",
      ]
      TABLE_DEPR = ["align", "bgcolor"]
      TABLE_CONTENTS = [
        "caption",
        "col",
        "colgroup",
        "thead",
        "tfoot",
        "tbody",
        "tr",
      ]
      TR_ELT = ["tr"]
      TALIGN_ATTRS = [ATTRS, CELLHALIGN, CELLVALIGN]
      TH_TD_DEPR = ["nowrap", "bgcolor", "width", "height"]
      TH_TD_ATTR = [
        ATTRS,
        "abbr",
        "axis",
        "headers",
        "scope",
        "rowspan",
        "colspan",
        CELLHALIGN,
        CELLVALIGN,
      ]
      TEXTAREA_ATTRS = [
        ATTRS,
        "name",
        "disabled",
        "readonly",
        "tabindex",
        "accesskey",
        "onfocus",
        "onblur",
        "onselect",
        "onchange",
      ]
      TR_CONTENTS = ["th", "td"]
      BGCOLOR_ATTR = ["bgcolor"]
      LI_ELT = ["li"]
      UL_DEPR = ["type", "compact"]
      DIR_ATTR = ["dir"]

      [
        [
          "a",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "anchor ",
          HTML_INLINE,
          nil,
          A_ATTRS,
          TARGET_ATTR,
          [],
        ],
        [
          "abbr",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "abbreviated form",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "acronym",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "address",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "information on author",
          INLINE_P,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "applet",
          false,
          false,
          false,
          false,
          true,
          :loose,
          true,
          "java applet ",
          FLOW_PARAM,
          nil,
          [],
          APPLET_ATTRS,
          [],
        ],
        [
          "area",
          false,
          true,
          true,
          true,
          false,
          :any,
          false,
          "client-side image map area ",
          EMPTY,
          nil,
          AREA_ATTRS,
          TARGET_ATTR,
          ALT_ATTR,
        ],
        [
          "b",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "bold text style",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "base",
          false,
          true,
          true,
          true,
          false,
          :any,
          false,
          "document base uri ",
          EMPTY,
          nil,
          [],
          TARGET_ATTR,
          HREF_ATTRS,
        ],
        [
          "basefont",
          false,
          true,
          true,
          true,
          true,
          :loose,
          true,
          "base font size ",
          EMPTY,
          nil,
          [],
          BASEFONT_ATTRS,
          [],
        ],
        [
          "bdo",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "i18n bidi over-ride ",
          HTML_INLINE,
          nil,
          CORE_I18N_ATTRS,
          [],
          DIR_ATTR,
        ],
        [
          "big",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "large text style",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "blockquote",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "long quotation ",
          HTML_FLOW,
          nil,
          QUOTE_ATTRS,
          [],
          [],
        ],
        [
          "body",
          true,
          true,
          false,
          false,
          false,
          :any,
          false,
          "document body ",
          BODY_CONTENTS,
          "div",
          BODY_ATTRS,
          BODY_DEPR,
          [],
        ],
        [
          "br",
          false,
          true,
          true,
          true,
          false,
          :any,
          true,
          "forced line break ",
          EMPTY,
          nil,
          CORE_ATTRS,
          CLEAR_ATTRS,
          [],
        ],
        [
          "button",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "push button ",
          [HTML_FLOW, MODIFIER],
          nil,
          BUTTON_ATTRS,
          [],
          [],
        ],
        [
          "caption",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "table caption ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "center",
          false,
          true,
          false,
          false,
          true,
          :loose,
          false,
          "shorthand for div align=center ",
          HTML_FLOW,
          nil,
          [],
          HTML_ATTRS,
          [],
        ],
        [
          "cite",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "citation",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "code",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "computer code fragment",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "col",
          false,
          true,
          true,
          true,
          false,
          :any,
          false,
          "table column ",
          EMPTY,
          nil,
          COL_ATTRS,
          [],
          [],
        ],
        [
          "colgroup",
          false,
          true,
          false,
          false,
          false,
          :any,
          false,
          "table column group ",
          COL_ELT,
          "col",
          COL_ATTRS,
          [],
          [],
        ],
        [
          "dd",
          false,
          true,
          false,
          false,
          false,
          :any,
          false,
          "definition description ",
          HTML_FLOW,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "del",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "deleted text ",
          HTML_FLOW,
          nil,
          EDIT_ATTRS,
          [],
          [],
        ],
        [
          "dfn",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "instance definition",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "dir",
          false,
          false,
          false,
          false,
          true,
          :loose,
          false,
          "directory list",
          BLOCKLI_ELT,
          "li",
          [],
          COMPACT_ATTRS,
          [],
        ],
        [
          "div",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "generic language/style container",
          HTML_FLOW,
          nil,
          HTML_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "dl",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "definition list ",
          DL_CONTENTS,
          "dd",
          HTML_ATTRS,
          COMPACT_ATTR,
          [],
        ],
        [
          "dt",
          false,
          true,
          false,
          false,
          false,
          :any,
          false,
          "definition term ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "em",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "emphasis",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "embed",
          false,
          true,
          false,
          false,
          true,
          :loose,
          true,
          "generic embedded object ",
          EMPTY,
          nil,
          EMBED_ATTRS,
          [],
          [],
        ],
        [
          "fieldset",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "form control group ",
          FIELDSET_CONTENTS,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "font",
          false,
          true,
          false,
          false,
          true,
          :loose,
          true,
          "local change to font ",
          HTML_INLINE,
          nil,
          [],
          FONT_ATTRS,
          [],
        ],
        [
          "form",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "interactive form ",
          FORM_CONTENTS,
          "fieldset",
          FORM_ATTRS,
          TARGET_ATTR,
          ACTION_ATTR,
        ],
        [
          "frame",
          false,
          true,
          true,
          true,
          false,
          :frameset,
          false,
          "subwindow ",
          EMPTY,
          nil,
          [],
          FRAME_ATTRS,
          [],
        ],
        [
          "frameset",
          false,
          false,
          false,
          false,
          false,
          :frameset,
          false,
          "window subdivision",
          FRAMESET_CONTENTS,
          "noframes",
          [],
          FRAMESET_ATTRS,
          [],
        ],
        [
          "htrue",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "heading ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "htrue",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "heading ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "htrue",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "heading ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "h4",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "heading ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "h5",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "heading ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "h6",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "heading ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "head",
          true,
          true,
          false,
          false,
          false,
          :any,
          false,
          "document head ",
          HEAD_CONTENTS,
          nil,
          HEAD_ATTRS,
          [],
          [],
        ],
        [
          "hr",
          false,
          true,
          true,
          true,
          false,
          :any,
          false,
          "horizontal rule ",
          EMPTY,
          nil,
          HTML_ATTRS,
          HR_DEPR,
          [],
        ],
        [
          "html",
          true,
          true,
          false,
          false,
          false,
          :any,
          false,
          "document root element ",
          HTML_CONTENT,
          nil,
          I18N_ATTRS,
          VERSION_ATTR,
          [],
        ],
        [
          "i",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "italic text style",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "iframe",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "inline subwindow ",
          HTML_FLOW,
          nil,
          [],
          IFRAME_ATTRS,
          [],
        ],
        [
          "img",
          false,
          true,
          true,
          true,
          false,
          :any,
          true,
          "embedded image ",
          EMPTY,
          nil,
          IMG_ATTRS,
          ALIGN_ATTR,
          SRC_ALT_ATTRS,
        ],
        [
          "input",
          false,
          true,
          true,
          true,
          false,
          :any,
          true,
          "form control ",
          EMPTY,
          nil,
          INPUT_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "ins",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "inserted text",
          HTML_FLOW,
          nil,
          EDIT_ATTRS,
          [],
          [],
        ],
        [
          "isindex",
          false,
          true,
          true,
          true,
          true,
          :loose,
          false,
          "single line prompt ",
          EMPTY,
          nil,
          [],
          PROMPT_ATTRS,
          [],
        ],
        [
          "kbd",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "text to be entered by the user",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "label",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "form field label text ",
          [HTML_INLINE, MODIFIER],
          nil,
          LABEL_ATTRS,
          [],
          [],
        ],
        [
          "legend",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "fieldset legend ",
          HTML_INLINE,
          nil,
          LEGEND_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "li",
          false,
          true,
          true,
          false,
          false,
          :any,
          false,
          "list item ",
          HTML_FLOW,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "link",
          false,
          true,
          true,
          true,
          false,
          :any,
          false,
          "a media-independent link ",
          EMPTY,
          nil,
          LINK_ATTRS,
          TARGET_ATTR,
          [],
        ],
        [
          "map",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "client-side image map ",
          MAP_CONTENTS,
          nil,
          HTML_ATTRS,
          [],
          NAME_ATTR,
        ],
        [
          "menu",
          false,
          false,
          false,
          false,
          true,
          :loose,
          false,
          "menu list ",
          BLOCKLI_ELT,
          nil,
          [],
          COMPACT_ATTRS,
          [],
        ],
        [
          "meta",
          false,
          true,
          true,
          true,
          false,
          :any,
          false,
          "generic metainformation ",
          EMPTY,
          nil,
          META_ATTRS,
          [],
          CONTENT_ATTR,
        ],
        [
          "noframes",
          false,
          false,
          false,
          false,
          false,
          :frameset,
          false,
          "alternate content container for non frame-based rendering ",
          NOFRAMES_CONTENT,
          "body",
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "noscript",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "alternate content container for non script-based rendering ",
          HTML_FLOW,
          "div",
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "object",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "generic embedded object ",
          OBJECT_CONTENTS,
          "div",
          OBJECT_ATTRS,
          OBJECT_DEPR,
          [],
        ],
        [
          "ol",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "ordered list ",
          LI_ELT,
          "li",
          HTML_ATTRS,
          OL_ATTRS,
          [],
        ],
        [
          "optgroup",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "option group ",
          OPTION_ELT,
          "option",
          OPTGROUP_ATTRS,
          [],
          LABEL_ATTR,
        ],
        [
          "option",
          false,
          true,
          false,
          false,
          false,
          :any,
          false,
          "selectable choice ",
          HTML_PCDATA,
          nil,
          OPTION_ATTRS,
          [],
          [],
        ],
        [
          "p",
          false,
          true,
          false,
          false,
          false,
          :any,
          false,
          "paragraph ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          ALIGN_ATTR,
          [],
        ],
        [
          "param",
          false,
          true,
          true,
          true,
          false,
          :any,
          false,
          "named property value ",
          EMPTY,
          nil,
          PARAM_ATTRS,
          [],
          NAME_ATTR,
        ],
        [
          "pre",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "preformatted text ",
          PRE_CONTENT,
          nil,
          HTML_ATTRS,
          WIDTH_ATTR,
          [],
        ],
        [
          "q",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "short inline quotation ",
          HTML_INLINE,
          nil,
          QUOTE_ATTRS,
          [],
          [],
        ],
        [
          "s",
          false,
          true,
          false,
          false,
          true,
          :loose,
          true,
          "strike-through text style",
          HTML_INLINE,
          nil,
          [],
          HTML_ATTRS,
          [],
        ],
        [
          "samp",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "sample program output, scripts, etc.",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "script",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "script statements ",
          HTML_CDATA,
          nil,
          SCRIPT_ATTRS,
          LANGUAGE_ATTR,
          TYPE_ATTR,
        ],
        [
          "select",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "option selector ",
          SELECT_CONTENT,
          nil,
          SELECT_ATTRS,
          [],
          [],
        ],
        [
          "small",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "small text style",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "span",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "generic language/style container ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "strike",
          false,
          true,
          false,
          false,
          true,
          :loose,
          true,
          "strike-through text",
          HTML_INLINE,
          nil,
          [],
          HTML_ATTRS,
          [],
        ],
        [
          "strong",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "strong emphasis",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "style",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "style info ",
          HTML_CDATA,
          nil,
          STYLE_ATTRS,
          [],
          TYPE_ATTR,
        ],
        [
          "sub",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "subscript",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "sup",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "superscript ",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "table",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "",
          TABLE_CONTENTS,
          "tr",
          TABLE_ATTRS,
          TABLE_DEPR,
          [],
        ],
        [
          "tbody",
          true,
          false,
          false,
          false,
          false,
          :any,
          false,
          "table body ",
          TR_ELT,
          "tr",
          TALIGN_ATTRS,
          [],
          [],
        ],
        [
          "td",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "table data cell",
          HTML_FLOW,
          nil,
          TH_TD_ATTR,
          TH_TD_DEPR,
          [],
        ],
        [
          "textarea",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "multi-line text field ",
          HTML_PCDATA,
          nil,
          TEXTAREA_ATTRS,
          [],
          ROWS_COLS_ATTR,
        ],
        [
          "tfoot",
          false,
          true,
          false,
          false,
          false,
          :any,
          false,
          "table footer ",
          TR_ELT,
          "tr",
          TALIGN_ATTRS,
          [],
          [],
        ],
        [
          "th",
          false,
          true,
          false,
          false,
          false,
          :any,
          false,
          "table header cell",
          HTML_FLOW,
          nil,
          TH_TD_ATTR,
          TH_TD_DEPR,
          [],
        ],
        [
          "thead",
          false,
          true,
          false,
          false,
          false,
          :any,
          false,
          "table header ",
          TR_ELT,
          "tr",
          TALIGN_ATTRS,
          [],
          [],
        ],
        [
          "title",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "document title ",
          HTML_PCDATA,
          nil,
          I18N_ATTRS,
          [],
          [],
        ],
        [
          "tr",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "table row ",
          TR_CONTENTS,
          "td",
          TALIGN_ATTRS,
          BGCOLOR_ATTR,
          [],
        ],
        [
          "tt",
          false,
          true,
          false,
          false,
          false,
          :any,
          true,
          "teletype or monospaced text style",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
        [
          "u",
          false,
          true,
          false,
          false,
          true,
          :loose,
          true,
          "underlined text style",
          HTML_INLINE,
          nil,
          [],
          HTML_ATTRS,
          [],
        ],
        [
          "ul",
          false,
          false,
          false,
          false,
          false,
          :any,
          false,
          "unordered list ",
          LI_ELT,
          "li",
          HTML_ATTRS,
          UL_DEPR,
          [],
        ],
        [
          "var",
          false,
          false,
          false,
          false,
          false,
          :any,
          true,
          "instance of a variable or program argument",
          HTML_INLINE,
          nil,
          HTML_ATTRS,
          [],
          [],
        ],
      ].each do |descriptor|
        name = descriptor[0]

        d = Desc.new(*descriptor)

        # flatten all the attribute lists (Ruby1.9, *[a,b,c] can be
        # used to flatten a literal list, but not in Ruby1.8).
        d[:subelts] = d[:subelts].flatten
        d[:attrs_opt] = d[:attrs_opt].flatten
        d[:attrs_depr] = d[:attrs_depr].flatten
        d[:attrs_req] = d[:attrs_req].flatten

        DefaultDescriptions[name] = d
      end
    end
  end
end
